diff -r 21012515c249 PC/_msi.c
--- a/PC/_msi.c	Thu Apr 24 13:22:47 2014 -0500
+++ b/PC/_msi.c	Tue Apr 29 23:04:52 2014 +0200
@@ -315,6 +315,12 @@
         case ERROR_INVALID_PARAMETER:
             PyErr_SetString(MSIError, "invalid parameter");
             return NULL;
+        case ERROR_OPEN_FAILED:
+            PyErr_SetString(MSIError, "open failed");
+            return NULL;
+        case ERROR_CREATE_FAILED:
+            PyErr_SetString(MSIError, "create failed");
+            return NULL;
         default:
             PyErr_Format(MSIError, "unknown error %x", status);
             return NULL;